19112381 has 2 divisors, whose sum is σ = 19112382. Its totient is φ = 19112380.

The previous prime is 19112377. The next prime is 19112393. The reversal of 19112381 is 18321191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 2839225 = 4034^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 19112381 - 2² = 19112377 is a prime.

It is a super-2 number, since 2×19112381² = 730566214978322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19112381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19112311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9556190 + 9556191.

It is an arithmetic number, because the mean of its divisors is an integer number (9556191).

Almost surely, 2^19112381 is an apocalyptic number.

It is an amenable number.

19112381 is a deficient number, since it is larger than the sum of its proper divisors (1).

19112381 is an equidigital number, since it uses as much as digits as its factorization.

19112381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 26.

The square root of 19112381 is about 4371.7709226354. The cubic root of 19112381 is about 267.3652321409.

The spelling of 19112381 in words is "nineteen million, one hundred twelve thousand, three hundred eighty-one".